Concentration of oses



Rama Jan. 1938 h 4 Re. 20,614

George H. Wigton. Eureka, Utah No Drawing. Original No. 1,783,207, dated Deamber 2, 1930, Serial No. 375,892, July 3, 1929. Application for reissue October 6, 1931, Serial No. 587,290

15 Claims. (01. 209-166) This invention relates to the concentration of on the are with which I have been working. It ores by flotation and is particularly applicable may be prepared in the following manner: to the treatment of those ores in which the val- 10 r ms p lv r Phosphorus P fi uable minerals occur entirely or in a partially was slowly added to a solution of 40 grams alpha. 5 oxidized state. Heretofore, most of the eflorts naphthylamine in 20 grams ortho toluidine, with to float oxidized ores have included a preliminary constant stirringv Stirring was continued occastep designed to place a sulfid film on the parsionally for one hour, at the end of which time ticles of oxidized minerals, followed by a similar a. brown translucent liquid resulted. The liquid flotation operation to that practiced on sulfid was viscous, but n t en u h S to P v Satisl0 ores. Sulfldizing operations are objectionable factory feeding of such a reagent in mill operon many ores, because they tend to reduce silver ations. extraction if enough sulfldizlng agent is added To illustrate the action of this compound, reto insure high recovery of the base metals and a sults are given of a teston oxidized ore from the clean concentrate. Also, the consumption of the Eureka Lilly mine. This ore is highly oxidized, l5 sulfidizing a n r ning very much containing only 0.2% sulfur. The ore was ground hydrated iron oxide is very hi h. Efl'or o flo t with water in a laboratory ball mill until it passed the Oxidized minerals Without by a 100 mesh screen. The pulp was then placed in using a reagent with a strong collecting action, a laboratory fl tation c911 and subjected t flolike oleic acid, result in flotation sonon-selective t t operations that good extraction and high grade concentrate Reagents were aded in four 388$ Sodium 20 are impossible Produce slmultaneouslysilicate solution was added to properly condition This application is a continua-171! m part of the pulp and to prevent excess irothing in the my application, serial 237,349 med June later stages. The compound referred to above 1923- acted both as collecting agent and frothing 26 The Present inventmn is based on the discovery agent. The following table shows the amount of that a class of compounds formed by the reaction reagents in pounds per t added t each stage,

of amino communds with Phosphorus Dents" Each stage covered a period of five minutes. sulfid are efi'ective flotation agents, not only for the sulfid minerals, but also for the oxidized min- Reconstructed 30 erals of gold, silver, lead and copper. While all r Sodium alpha p p 30 the reconstructed amino compounds tried have Stage ili $,i$? shown the ability to float oxidized minerals, I dine have found the reaction products of phosphorus pentasulfld with aniline, orthotoluidine and alpha 0 o. 25

naphthylamine, respectively, to give most satisg g- 35 factory results. 2;; 0125 The reaction products of amino compounds with phosphorus pentasulfld are solids. In floh ta were as follows; tation operations it is advantageous to have the The resuits of t e s 4o reagents in a liquid condition in order that they Percent may easily and accurately be added to the flota- PM Amy recoveries tion pulp. Consequently it becomes. desirable to cent dissolve these solid reaction products in an inert m Ag Pb Ins Au Ag Pb solvent, such as benzol, for example. In some cases it may be preferable to dissolve the amino Ore mo 00 217 3 22 13 m4 O pOun in a inert liquid hydrocarbon before contextual: 27104 :42 810 4115 32.4 53.33 68.63 84.96 reacting it with phosphorus pentasulfld A Talling 12.26 .14 1.4 2.2 46.62 31.37 15.04

liquid product may also be obtained by reacting a large excess of a liquid amino compound with It will be understood that the foregoing is 50 phosphorus pentasulfid or by reacting a soluonly a single example of procedure, and Ida not 50 tion of a solid amino compound in a liquid amino wish the invention to be limited to this specific compound with phosphorus pentasulfld. agent or method. The reaction product of phosphorus penta- I claim:

sulfid with a solution of alpha naphthylamine l. The process of concentrating ox dized ores in ortho toluidine gives particularly good results by froth flotation which comprises sub ecting the 5! p in the presence of the reaction product of an oxygen free aromatic amino compound and phosphorus pentasulfld.

2. The process of concentrating oxidized ores by froth flotation which comprises subjecting the ore in the tomb! a pulp to a flotation operation in the presence of the reaction product of alpha naphthylamine and phosphorus pentasuifld.

3. The process of concentrating oxidized ores by froth flotation which comprises subjecting the ore in the formof a pulp to a flotation operation in the presence of the reaction product of phosphorus pentasulfld with a solution of alpha naphthylamine in-ortho toluidine.

4. The process of concentrating oxidized ores by froth flotation which comprises subjecting the ore in the form of a pulp to a flotation operation in the presence of the reaction product of an oxygen free aromatic amino compound with sulfur and phosphorus.

5. An agent for use in flotation comprising th reaction product of alpha naphthylamine with phosphorus pentasulfid.

6. An agent for use in flotation comprising the reaction product of phosphorus pentasulfld with asolution of alpha naphthylamine in ortho toluidine.

7. The process of concentrating oxidized ores by'froth flotation which comprises subjecting the ore in the form of a pulp to a flotation operation in the presence of sodium silicate and the reaction product of an oxygen free aromatic amino compound and phosphorus pentasulfld.

8. The process of concentrating oxidized ores by froth flotation which comprises subjecting the ore in the form of a pulp to a flotation operation in the presence of sodium silicate and the reaction product of alpha naphthylamine and phosphorus pentasulfld.

9. The process of concentrating oxidized ores by froth flotation which comprises subjecting the ore in the form of .a pulp to a flotation operation '45 in the presence of sodium silicate and the reaction product of phosphorus pentasulfld with a solution of alpha naphthylamine in ortho toluidine.

h 20,014 ore in the form of a pulp to a flotation operation 10. The process of concentrating oxidised era by froth flotation which comprises subjecting the on in the form of a pulp to a flotation operation in the presence of sodium silicate and the reaction product of an omen free aromatic amino compound with sulfur and phosphorus.

11.. The process of concentrating ores by froth flotation which comprises subjectingthe ore in the form of a pulp to a flotation operation in the presence of sodium silicate and in the presence of the reaction product of an oxygen free aromatic amino compound and phosphorus pentasulfld, the reaction product being added to the pulp in stages.

12. The rocess of claim 7 in which the amino compound is diwolved in an inert liquid hydrocarbon prior to mixing with the phosphorus pen-' tasulfld.

13. The process of concentrating ores by froth flotation which comprises subjecting the ore in the form of a pulp and in presence of sodium silicate to a flotation operation in the presence of successive stage additions of the reaction product of sn-amino compound and phosphorus pentasulfld.

14. The process of concentrating oxidized ores by froth flotation which comprises subjecting the ore in the form of a pulp to a flotation operation in the presence of sodium silicate to render the circuit non-alkaline, and in the presence of the reaction product of an ongen free aromatic amino compound and phosphorus pentasulfld.

15. The process of concentrating ores which are larscLv oxidized which consists in subjecting A the ore in the form of a pulp to a flotation operation in a circuit made non-alkaline by the addition of sodium silicate. in the presence of the reaction product or an oxygen free aromatic amino compound and phosphorus pentasulfld,

said reagent being added to the pulp in stages so as first to remove any sulfld mineral, which sulfld mineral tends to prevent the complete flotation of the oxidized mineral with only one addition of reagent. .onoaos n. mirrors. 

